Die for corrugating bars or tubes



(No Model.)

C. P. HIGGINS.

DIE POR GOIRUGATING BARS 0R TUBES. No. 364,349. PatentedJune 7, 1887.

WIM/55555. l ZW l 2 7 u jw ATTORNEY.

N. PEI'ERS. PhnwLnhagmpher. waxhingtnn. D. C.

UNITED STATES PATENT OFFICEo CAMPBELL P. HIGGINS, OF BROOKLYN, NEW YORK.

DIE FOR CORRUGATING BARS oa TUBES.

SPECIFICATION forming part of Letters Patent No. 364,349, dated June 7,1887.

Application filed December 7, 1886. Serial No. 220,925. (No model.)

To @ZZ wiz/0m, it may concern.-

Be it known that l, CAMPBELL P.. HIGGINS, a citizen of the UnitedStates, residing at Brooklyn, New York, have invented a new and usefulImprovement in Forming Corrugated Tubes or Bars, of which the followingis a specification, reference being had tothe accompanyingdrawings, inwhich- Figure lis a central vertical longitudinal section on the line xx, Fig. 2, or" a pair of dies in their closed position 5 Fig. 2, avertical transverse section of the same on the line x x', Fig. l; Fig.3, a partial longitudinal section similar to Fig. 1, but showing thedies in their open position; and Fig. 4, a transverse section in thesame plane as Fig. 2, the position corresponding with Fig. 3. Fig. 5 isa vertical transverse section of Fig. l on the line x e. Fig. 6 is apartial plan View of the upper dietrough, D; Fig. 7, a partial exteriorelevation of one of the sections or" the lower die; Fig. 8, an end viewof both sections of the lower die; Fig. 9, a plan View of Fig. 7; Fig.10, a partial interior elevation of one of the upper diesections, andFig. 11 an inverted plan view of rig. 1o.

Similar letters of reference indicate corresponding parts in the severalgures.

This invention relates to improvements in machinery for forming frommalleable iron tubes of rectangular shape in cross-section corrugatedheaders for use in sectional steamboilers, said invention beingadaptable, also, to corrugating solid rectangular bars; and in orderthat others may understand and use the same, I will proceed to describethe details of itsconstruction, explain its operation, and subsequentlypoint out in the appended claims its novel characteristics.

Referring to the drawings, A A and B B' are dies or formers havinginterior workingfaces which present together' a rectangular shape incross-section and are capable of both vertical and lateral contraction.The vertically-acting faces are of serpentine form longitudinally, theseveral projecting curvatures of either set of dies corresponding inposition with depressed curvatures in the counterpart faces of theopposite set. The lateral vertical faces present plane surfacesthroughout the lengthof the interior, and are composed of interlockingplates or tongues which approximate in width to each unit of corrugationand project alternately from the upper and lower sets of diese-viz., 1,2, 3, 4,-5 from the upper set and 6, 7, 8, -9 from the lower set of'saiddies.

The lateral contractile movement of the dies is acquired by theirvertical longitudinal subdivision into equal sections or pairs, theseveral inclined webs a a b b of which engage with the converginginterior surfaces of the trough-like abutxnents D E and cause acompression of the halves of the dies toward one another in a directionat right angles to the Inotion of the abutments during the act ofcorrugation.

The sections A and A, B and B',of the upper and lower dies are retainedin their proper coinciding relations to one another by means of thebolts c eand f f, respectively, the heads of which are contained incountersunk sockets, as shown in Fig. 5,which are sufficientlyconntersunk to allow a separation of the sections to the extent shown inFig. 4 at the timewhen the dies are separated. Similar bolts, g, Fig. 4,are employed to suspend the upper die-sections in the abutment D; butthe same have also a transverse elongation of their sockets in the saidabutment (shown by Fig. 6) provided in order` to permit the lateralmovement of the said sections. In the present instance the lowerdie'sections are in turn snspended to the upper dic-sections by means ofbolts or bars c, which. project through vertical slots c',formed inseveral of the inclined webs.

a a b b', said slots being of suiiicient combined vertical length topermit the necessary motion of the dies, the bolts c being retained inplace by spring-pins c. However, the sections B B may be connectedindependentl y to the abutment E by bolts similar to the bolts g of thesections A A', and incident to this construction the lower pairof diesmay be provided with suitable springs interposed beneath between themand the abutment E, to serve thepurpose of lifting and releasing themfrom lateral compression between the inclines of said abutment E when itis desired to insert or remove the work. The said springs are notillustrated herewith, being of any wel1- known forninas, for instance,spiral-and coiled about the said bolts corresponding with the bolts gorsubstituted in place of the same.

ICO

' firmly press against the vertical sides of the interiorB By theclosing movement of the press the abutments D and E are made toapproach, and as'the work comes in contact with the acting serpentinefaces h z' of the dies the latter are forced between the convergingfaces of the abutments, and by reason of the wedging action of theinclined webs a. c b b are compressed laterally simultaneously withtheir vertical compression upon the exterior ofthe work.

The action of wedging the interior sectional mandrel employed in thisoperation outwardly against the vertical sides of the blank and wedgingthe interlocking sectional sides or tongues l 2 3, 850 of the diesinwardly, so as to bear solidly upon the exterior, clamps the metalfirmly between the two surfaces, and prevents the saine from bucklingwhen the operation of pressing into corrugations is performed, the saidsectional surfaces corresponding with each unit of corrugation andmoving alternately in unison with one another, thereby carrying theadjacent portions of the metal supported by and gripped between them indirections corresponding to the movements of the corrugations. 4

- Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

1. The combination of upper and lower diecarriers having exteriorsurfaces inclined toadapted to move with the surface of the metal f'being corrugated.

4. Corrugating-dies having the working sides formed of a series ofinterlocking tongues, said tongues approximating in width to a unit ofthe corrugation, and adapted to approach each other and to move with andin the same direction of the surface of the metal being corrugated. y

5. In corrugating-dies, the combination of the following elements:first, dies provided Vwith interlocking tongues having exterior inclinedplanes and adapted to clamp the sides of the article to be corrugatedand to move therewith; second, trough-shaped carriers adapted to lit theexterior of said interlocking tongues or dies.

6. In corrugatingdies, the combination of the following elementsz'first, dies comprising interlocking tongues having exterior inclinedsurfaces and adapted to clamp the surfaces of the blank which theyinelose; second, troughshaped carriers adapted to tit the exterior ofsaid interlocking tongues or dies, and, third, means, as loose-fittingbolts, for con uectin g the dies with the carriers.

CAMPBELL l?. HIGGINS.

Witnesses:

CHAs'. V. FoRBns, A.' CREVELING.

